docs: def get_document(self, id):
          """
          Retrieves a particular document from this project.
          """
          obj_list = self.document_list
          matches = [i for i in obj_list if str(i.id) == str(id)]
          if not matches:
              raise DoesNotExistError("The resource you've requested does not \
  exist or is unavailable without the proper credentials.")
          return matches[0]